1、BRITISH STANDARDBS EN 2591-222:2007Aerospace series Elements of electrical and optical connection Test methods Part 222: Insertion Loss (I.L.)ICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g4
2、0g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 2591-222:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008ISBN 978 0 580 56476 5National forewordThis British Standard is the UK implementation of EN 2591-222:2
3、007. The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the nece
4、ssary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 2591-222December 2007ICS 49.
5、060English VersionAerospace series - Elements of electrical and optical connection- Test methods - Part 222: Insertion Loss (I.L.)Srie arospatiale - Organes de connexion lectrique etoptique - Mthodes dessais - Partie 222 : Pertes dinsertionLuft- und Raumfahrt - Elektrische und optischeVerbindungsele
6、mente - Prfverfahren - Teil 222:EinfgungsdmpfungThis European Standard was approved by CEN on 27 April 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alterati
7、on. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translati
8、onunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greec
9、e, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Cen
10、tre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2591-222:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Preparation of specimens.4 4 Apparatus .5 5 Procedure .5 6 R
11、equirement.6 7 Detail to be specified.6 Annex A (normative) Definition of S parameters .8 BS EN 2591-222:20073 Foreword This document (EN 2591-222:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out
12、 in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publi
13、cation of an identical text or by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall
14、not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estoni
15、a, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 2591-222:20074 1 Scope This standard specifies a measurement metho
16、d of insertion loss, in the required frequency bandwidth of coax contacts or connectors with characteristic impedance. It shall be used together with EN 2591-100. The measurement is carried out according to vectorial method using “S” parameters (see definition in Annex A). 2 Normative references The
17、 following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2591-100, Aerospace series Elements of electrical
18、 and optical connection Test methods Part 100: General. 3 Preparation of specimens The sampling shall include, for each specified cable, a minimum of two section of coaxial cable with connector in both ends. The first section called “Reference” is constituted as follow (see Figure 1): (600 5) mm of
19、coaxial cable 1 male coaxial connector (SMA, N or TNC type ) 1 female coaxial connector (SMA, N or TNC type ) Key 1 Coaxial (Std) female connector 2 Coaxial (Std) male connector 3 Coaxial cable; Lg. = (600 5) mm Figure 1 1 2 3BS EN 2591-222:20075 The coaxial connectors shall be selected to offer opt
20、imum performances for each used cable and measured frequency range. They must have a reflection coefficient better than 0,1 ( 20 dB) in the test frequency range. It is necessary to use the same type of connector on each section of cable. The second section called “Measure” (see Figure 2) is constitu
21、ted by the same elements as “Reference Section”, the sample to be measured shall be installed in the middle of the section of the cable. Key 1 Coaxial (Std) female connector 2 Device under test 3 Coaxial (Std) male connector 4 Coaxial cable; Lg. = 2 (300 2,5) mm Figure 2 4 Apparatus The apparatus sh
22、all comprise measuring equipment which includes (see Figure 3): vector network analyser calibration kit standard precision adapters a 75 kit of transformation, to perform measurement from 50 network analyser, when it is necessary. 5 Procedure 5.1 Calibration Select measure frequency range and sampli
23、ng points number. Carry out the complete calibration of network analyser, Part 1 and Part 2 (“S” Parameters, S11, S12, S21and S22) Using calibration kit according to instructions specified by network analyser manufacturer. 3 41 4 2BS EN 2591-222:20076 5.2 Measurement Connect reference section on net
24、work analyser, using if necessary, standard precision adapter. Perform the measurement, and run the curves tracer or record the values (S12, S21parameters). Move “reference section”, connect the “measure section” on the equipment, run the measurement and curve tracer, or record the values as above.
25、6 Requirement Sample insertion loss, which is measured, is the result of: (measured insertion loss reference insertion loss). Insertion loss shall not exceed the values specified in the product standard. (The insertion loss of one contact or connector shall be the insertion loss of the contact or co
26、nnector pair divided by two). 7 Detail to be specified The following items shall be specified: coaxial devices (contact or connector) part numbers coaxial cables part number standard coaxial connectors part number network analyser, manufacturer, type and serial number frequency range sampling point
27、number standard precision adapter part number measurement impedance (50 or 75 ) for coaxial contact, connection length wiring instruction and tooling for thread coupling connectors, the coupling torque of the coupling ring. BS EN 2591-222:20077 Key 1 Vector network analyser 2 RF generator and “S” pa
28、rameter test set Legend Precision hermaphroditic connectors Standard Precision Adapters Figure 3 Hermaphrodite Interface Standard Coaxial Connector Interface Device Under Test Interface BS EN 2591-222:20078 Annex A (normative) Definition of S parameters A.1 Effective Power of a Sinusoidal source Con
29、sider an E.M.F. source, E, measured in Vrmswith an internal impedance Zgand a load impedance Z. The applied power P dissipated in Z is defined as () ()Z eZZE*Z*Z*EZZZEe*I V e Pggg+=+=22)()(P is a maximum when *ZZg= (balanced load). This maximum power is known as the effective or RMS nota Root Mean S
30、quared power for a given source (E, Zg) and can be expressed as Prms= )(2gdZeEP=4In general, when Z has a different value to Zg, we define P as +=221)(gggZZ*Z-ZZeEP4where ggZZ*ZZ+is known as the Power Reflection Coefficient. The power dissipated in Z can be expressed as the difference of two powers,
31、 and when the source (E, Zg) power is maximum and when Z Zg, the amount of power reflected towards the source is equal to 2ggZZ*Z-Z+BS EN 2591-222:20079 A.2 Waves Incident and Reflected (Kurokawa Waves) Let us define an impedance, Z, in terms of a potential difference, V, and a current I. We also de
32、fine an Incident Wave, a, and a Reflected Wave, b, with respect to a Reference Resistance, Rg, as follows: the power dissipated in Z = P = |a|2 |b|2 the effective power generated by the source (E, Rg) = Prms= |a|2Expressing a and b in terms of V, I, Rg, gives: ggRI R Va2+= ggRI R Vb2= If Z is suppli
33、ed by the source (E, Rg) we can state that E = V + Rg.I which automatically validates Prms = |a|2. NOTE - Rgis known as the Reference Resistance for the “waves“ a and b - The word wave is written inside speech marks because a and b do not show the typical electromagnetic behaviour associated with cl
34、assical waves they are rather Power Waves - The definition of a and b is independent of that fact that the dipole Z is fed by a source of an internal resistance Rg- The power dissipated in Z is independent of the characteristics of the source and is always equal to |a|2|b|2- The ratio of the waves b
35、 to a is equal to (when V = Z.I) ggR ZR - Zab+= which is the Reflection Coefficient of the impedance Z with respect to the reference resistance Rg. BS EN 2591-222:200710 A.3 S Parameters of a quad pole Let us apply the precedent definition to the input and output of a quad pole device. This time we
36、define an incident and reflected wave, a1and b1, for the input side and incident and reflected wave, a2and b2, for the output side, relative to the input and output reference resistances, R1and R2. 111112 R I RVa+= 222222 R I RVa+= 111112 R I RVb= 222222 R I RVb= We can state that the system is line
37、ar and we can therefore re-write the above equations to express on variable in function of two of the other unknowns. b1= S11 a1+ S12 a2b2= S21 a1+ S22 a2These S Parameters are also known as the system distribution parameters and characterise the quad pole in function of its input and output referen
38、ce resistances, R1and R2. NOTE These S Parameters define the quad pole at a given frequency A.4 Physical Signification and Interest of S Parameters A.4.1 Physical significance of S11If S11= b1/a1, where a2= 0, then a2is equivalent to V2= R2.I2, the output of the quad pole is therefore closed loop on
39、 R2and if Zeis the input impedance of Q, then in these conditions, we can state that V1 = Ze.I1and S11is the input reflection coefficient with respect to R1when the output impedance = R2. 1111RZRZSee+=BS EN 2591-222:200711 A.4.2 Physical significance of S22In the same way, if S22= b2/a2then when a1=
40、 0, the input is closed loop on R1and under these conditions if Zois the output impedance, we obtain S22is the input reflection coefficient with respect to R2when the input impedance = R1. The Smmparameters are therefore defined as the Reflection Coefficients. A.4.3 Physical significance of S21If S2
41、1= b2/a1then when a2= 0, the output is closed loop on R2and therefore 111222211221IRVIRVRRabS+= If we assume that the quad pole Q is supplied by a source (E, R1) then E = V1+ R1.I1and V2= R2.I2The quad pole being supplied by a source of impedance R1and with a load R2will have a S Parameter S21propor
42、tional to a voltage gain called the System Transmission Coefficient. If we take the square of S21then we obtain )/12122221222221RMS PowerinRMS Power 44R (E, R RERVRREVS = where |S21|2is the Composite Power Gain. 2222RZRZSss+= EVRRS221212= BS EN 2591-222:200712 A.4.4 Physical significance of S12We ca
43、n do a similar calculation as above and we will find that, for a quad pole Q supplied by a source (E, R2) and whose input is closed loop on R1, the S12parameter is defined by EVRRS112212= S21is called the Inverse Transmission Coefficient. These S Parameters are used to characterise the junctions in
44、high frequency applications because they possess a number of advantages: these parameters are measurable at R1and R2. In practice we choose standard values for resistances R1and R2such as 50 ohms or 75 ohms. It is much easier to measure variables over a known resistance than on an open circuit (Z Pa
45、rameters) or in a short circuit (Y Parameters); in closing each side of the circuit allows frequency sweeping; as the termination resistances R1and R2are dissipative, the risks of instability during the analysis of the active quad pole are decreased (which is not the case for open or short-circuits)
46、; a simple device already exists to separate a and b waves at high frequencies. This device is the directional coupler. BS EN 2591-222:2007blankBS EN 2591-222:2007BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards Institute (BSI)BSI is
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